Brain fog and atypical depression are common symptoms of CFS/IBS/FM. There was a recent study that readers sent me that is a good kick-start for this post.

Bottom Line

There is growing evidence and a lot of research (note that every citation above is from 2017) that the gut microbiome alters cognitive function and behaviors. In terms of documented probiotics influencing cognitive function, Bifidobacterium longum NCC3001, would be a good start. I suspect most of the Bifidobacterium longum would be beneficial.

In my own experience, I have noticed that significant cognitive changes/improvement when I rotated to some probiotics. It does not happen always — and sometimes it only happens on the initial taking of the probiotic.